Useful Links & tips

Very nice HTML & css editor for learners. https://thimble.webmaker.org/en-US/

Hibernate has two options for locking Optimistic and Pessimistic. Optimistic Locking has more advantage over pessimistic by performance and etc,. To achieve  Optimistic Locking is very as adding a annotation for a field.  For more details read here..  http://docs.jboss.org/hibernate/orm/4.0/devguide/en-US/html/ch05.html#d0e2225  

This exception will occur when we use @Version for Optimistic Locking. This error means somewhere in the code same entity(table) has modified twice in same transaction or separate. In my situation we had manual flush, after removing that manual flush this error gone.

    @Id     @GeneratedValue(strategy = GenerationType.AUTO, generator ="CUSTOMER_SEQ_G")     @SequenceGenerator( name = "CUSTOMER_SEQ_G", sequenceName = "CUSTOMER_SEQ")     @Column(name = "CUSTOMER_ID")     private Long customerId; generator in @GeneratedValue should same as name in @SequenceGenerator sequenceName is Database Sequence object.

There is a option to deploy EAR/WAR as exploded folder in JBoss using jboss-maven-plugin. setting unpack "true" will do everything.... <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>jboss-maven-plugin</artifactId> <version>1.5.0</version> <configuration> <jbossHome>C:/jboss-6.1.0.Final</jbossHome> <serverName>all</serverName> <fileName>target/MyEar.ear</fileName> <unpack>true</unpack> </configuration> <executions> <execution> <id>harddelpoy</id> <phase>install</phase> <goals> <goal>harddeploy</goal> </goals> </execution> </executions> </plugin>

When we use Oracle driver in application which is deployed JBossAS, We have to place the Oracle driver jar in server/lib directory. If we keep the jar in our Ear or War file also will get this warning message. 15:56:40,098 WARN  [org.jboss.resource.adapter.jdbc.vendor.OracleValidConnectionChecker] Unexpected error in pingDatabase: java.lang.IllegalArgumentException: object is not an instance of declaring class To solve this, just remove the Oracle lib from your Ear or War.

<<Jboss-HOME>>/bin run.bat -c <<servername> -Djboss.service.binding.set=ports-01   <<servername>>  - could be server directory name (all or minimal). default value is "default"  -Djboss.service.binding.set=ports-01 - this option will increase all port numbers by 100. Example: HA-JNDI port default is 1099 and after using option 1199 There are 4 options available in Jboss6, to view those login into AdminConsole ( http://localhost:8080/admin-console/ ) Service Binding Manager Service Binding Sets ports-01 ports-02 ports-03 ports-default ports-default - 8080 and others ports-01 - +100 ports-02 -  +200 ports-03 -  +300